Radio apparatus



Nov. 22, 192 7. 1,650,032

T. E. NEW

RADIO APPARATUS Filed May 27. 1925 HIIIHIIHIHIIH n1 mmnnlnmq i Y m u r Hit g 24 23 77/0ms 7 A/fW Patented Nov. 22, 1927.

UNITED STATES PATENT OFFICE.

THOMAS E. NEW, OF CINCINNATI, OHIO, ASSIGNOR, BY DIRECT AND MESNE ASSIGN- 'MENTS, TO THE TELEFORCE RADIO LABORATORIES COMPANY, OF CINCINNATI,

OHIO, A CORPORATION OF OHIO.

RADIO APPARATUS.

Application filed May 27, 1925.

My,;invention relates to tuning units for radio receivers and the like.

object of my invention is to provide a device wherein a multiplicity of individual tuning devices and circuits can be controlled by. one tuning knob and dial. ;1 :Ano t l1eif object .of my invention '1s to provide a devicewherein several variable condensers and av yernierican' becontrolled with dndknobQQ I v i I :Another object ofmy invention is to'provide lat device that is simple and economical of constructionand operation to attain the .abovepbjectsl These. and other objects are attained by them earls described herein and disclosed in the accompanying drawings, in which:

Figfl anielevationa-l view of a device embodying my invention, partly shown in -c ro s s sectiorni 4 l -is a top'plan ,viewof the device shown in Fig. '1. 1 H

:F'g ,3 is section'al view taken on line 3 3 ofFig.1.' I

Fig. 4is a sectional view taken on line 44 of. Fig. 3. r j Fig. 5 is a wiring diagram of a radio circuit having embodied therein a device of my invention, the device being shown conventionally.

In a radio receiving set mploying two or more variable condensers it is often necessary to advance one of the condensers through a part of its arc and then advance the other condenser through a greater portion of its arc in order to get a satisfactory result. The device of my invention obviates this dual manipulation yet accomplishes the same results. My device comprises, generally, a frame 10, variable condensers 11 and 12 and a-vernier 13. The frame consists of a front plate 14 and rear plate 15 having secured between them side bars 16. The front and rear plates 14 and 15 have formed in them, in axial alignment, perforations 17 and 41,-throughwhich a shaft 18 extends. Rotor plates 19 and-2O of the condensers 11 and 12 are carried in spaced relation by the shaft 18, the usual spacing collars 21 being ner.

Serial No. 33,276.

plates 19 and are electrically connected through the shaft 18. The stator; plates" 22 and 23 of the condensers 11 and 12 are not electrically connected. .The stator plates of the respective condensersmay besoldere d to an L-shaped binding plate 24 or theymay be electrically connected many other man- Binding plates 24 have mounted "on them binding posts 25.; The" stator plates 22 and 23 are carriedfby'fand are ins'ul ated from cross bars 16"by irisulators 26. The insulators 26 securely hold and retain'ithe stator plates of'the condensers11' and'12 in position. The front"and rear plates 14 and 15 are provided withjextensions 27 and 28. The extension'si27 '28 have formed in them in axial alignment, perforations 29 and 43 through which shaftiaofer tends. The rotor plates 31"of the'vernier 13 are carried by the sha ft 3Q in spaced relation. The rotoitiplates 31 of, the vern ier 13 comprise ,a'central hub 44 having vanes 45 and 46 extending from 'the'hrib diametrically opposite one another] "Certain'of the stator plates 19 of the condenser '11 extend below the condenserproper and' constitute the stator plat-es 32 of the 'vernieri13. The special object of the vernier'will be explained later. H Front plate '14 has formed in it,'intermediate perforations :17 and .19, a third perforation 33 in axial alignment with a perforation 34formed in bearing bar 35. The bearing bar 35 is carried by the front plate 14. A stud shaft 36 having a knob 37 mounted on its front end extends through perforations 33 and 34. A nut or collar 47 is provided on the rear end of stud shaft 36 to secure the stud shaft in place. Stud shaft 36 has mounted on it a gear 37 and a pinion 38. The gear 37 meshes with a pinion 39 carried by one end ofshaft 30. .A gear carried by shaft 18 meshes with pinion 38 carried by shaft 36. It should be noted that by using the proper ratio between g ear 37 and pinion 39 and pinion 38 and gear 40 it is possible to rotate therotor plates of the vernier 13 a. number of timeswhile the rotor plates 19 and 20 arebeing rotated but once. It should also be noted that therotor plates 31 of the Vernier 13 areelectrically connected with the rotor plates 19 and 20 through. the shaft 18, gears 37 and 40, pinions 38 and 39 and shaft 30. v

makes but one-half of a -revolution.

In order" to make my invention clear and to explain the operation thereof, we will assume the shaft 30 bears a ratio of 520 to 1 to shaft 18. W0 willfurther assume that the capacity of condenser 11 is .0009 microfarad, that of condenser 12 .001 microfarad, and the vernier a capacity of .0002 .microfarad.

By using the ratio of to l the shaft 'will be revolved ten times while the shaft 18 The rotor plates 31;being mounted on the shaft 30 and the vanes and 46 of the plates be ing spaced 18Q apart, thevernier 13 woul d reach .its ma i iimum and minimum point of capacityt yice ineaclrrevolution of the shaft orjtvftfenty; times; while the rotor, plates 19 andLQO of the condensers lland l2 pass' fmiiig'theirminimum to .their ma tinium,

capacity in the condensers, and obtaining the true resonance of the primary condenser at practically anypointin thecycle of the primary condenser. Owing. to the difference i n capacities between the two condensers 11 and 12 the maximum point of capacity, or true-resonance, cannot be obtained from the two condensers at the same pointon the dial. In order to bridge the gap between the condensers and to obtain true resonance, I introduce the vernier 13. Attention is directed to the fact that where ordinarily two separate condensers are tuned by separate control knobs to obtain the-true resonance, I have accomplished the same result with but one control knob. It should therefore be noted that I have produced a single tuning unit composed of -a multiplicity of ordinarily in dividually tuned devices.

Fig. 5 shows a wiring dia ram for a radio receiving set employing a device of my invention. It is believed that the wiring diagrani is self explanatory and further description is unnecessary.

What I claim is:

1. In a device of the class described the combination with a condenser comprising a movable anda fixed plate, of a second con denser comprising a movable and a fixed plate, one plate of the second condenser electricallyconnected with a plate of the first condenser, and means for] effecting difiieren- (ifal movement of the plates of the two condensers.

2. In a device of the class described the combination of.- a pair of electrically connected variable condensers each having a. cycle onasha ftythe m'ovableiplates of the second 9 condensers mounted on a second shaft, the rotor plates be ng electrically connected,'.the

irom the frame, the" fixed plates being electrically connected, and "co-operating" means carried byth e shafts for efi 'ecting ajrapid movement of the .moyable plates'of one con denser to ays'lowfniovement of the movable plates of theother condenser. i

I 4. In a device of .the class'described the combinatioir' of a frame; a plurality of primary ,cond enserfs and a secondary eondenser e achj comprising movable'and fixed plates, the .mo'vablezplat e's" of the r'imary and secondary condensers being-'eiectii'cally connected, .the stationary plates of one of the primary condensers and the staticn'ary plates of the secondary condenser being electrically connected, thes't'a't'ionai'y"plates being carried by and insulated from the frame, and means carried by the" frame cooperating with means carried by the moyable" plates .for efiectiag'a difi erential movement of the movable plates'of the primary" and secondary condensers.

5. In a device of the class described the combination of a frame, a primary shaft. and a secondary shaft carried by the frame, a plurality of primary condensers and a secondary condenser, each comprising fixed and movable plates, the movable plates of the primary condensers 'being carried by the primary shaft and the movable plates of the secondary condenser being carried by the secondary shaft, the fixed plates being carried by and insulated from the frame, the XDOXZIblQ plates of the condensers being electrically connected,- a stud shaft carried by the frame, means mounted on the stud shaft co-operating with means mounted on the primary and secondary shaft for effecting a difierentia'l movement of the movable plates, and means carried by the stud shaft for actuating the shafts.

(3. In a device of the class described the combination of a primary tuning device for onecircuit comprising amovable member, a. secondary tuning device for asecond circuit comprising a movable member, said primary and secondary tuning devices being related whereby each may afiect the other for bringing the two circuits into resonance, and a single means for simultaneously and differentially actuating the movable members of both tuning devices.

7. In a device of the class described the combination of a pair of tuning devices, each having a cycle and each comprising a movable member, electrical compensating means between said tuning devices whereby each device may afiec-t the other device upon movement of the movable member of either, and means for difl'erential completion of the cycles of the individual tuning devices.

8. In a device of the class described the combination of a pair of tuning devices each comprising a movable member so related that movement of either will affect both tuning devices, the movable members each having a cycle, and common actuating means for the movable members effecting difierential completion of the cycles of the individual tuning devices.

In testimony whereof, I have hereunto subscribed my name this 20th day of May, 25

THOMAS E. NEW. 

